EP3512693B1 - Laserschweisssystem und verfahren unter verwendung einer maske zur steuerung der breite der schweissung - Google Patents

Laserschweisssystem und verfahren unter verwendung einer maske zur steuerung der breite der schweissung

Info

Publication number
EP3512693B1
EP3512693B1 EP17772831.8A EP17772831A EP3512693B1 EP 3512693 B1 EP3512693 B1 EP 3512693B1 EP 17772831 A EP17772831 A EP 17772831A EP 3512693 B1 EP3512693 B1 EP 3512693B1
Authority
EP
European Patent Office
Prior art keywords
workpieces
laser beam
mask
workpiece
slot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17772831.8A
Other languages
English (en)
French (fr)
Other versions
EP3512693A1 (de
Inventor
Alexander Savitski
Grzegorz Zdzislaw BUGAJ
Leo Klinstein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dukane IAS LLC
Original Assignee
Dukane IAS LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dukane IAS LLC filed Critical Dukane IAS LLC
Publication of EP3512693A1 publication Critical patent/EP3512693A1/de
Application granted granted Critical
Publication of EP3512693B1 publication Critical patent/EP3512693B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1635—Laser beams characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. laser transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B29C65/1616—Near infrared radiation [NIR], e.g. by YAG lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1629—Laser beams characterised by the way of heating the interface
    • B29C65/1654—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined
    • B29C65/1658—Laser beams characterised by the way of heating the interface scanning at least one of the parts to be joined scanning once, e.g. contour laser welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1696—Laser beams making use of masks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/349—Cooling the welding zone on the welding spot
    • B29C66/3494—Cooling the welding zone on the welding spot while keeping the welding zone under pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • B29C66/73366—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light both parts to be joined being transparent or translucent to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81267—Transparent to electromagnetic radiation, e.g. to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81266—Optical properties, e.g. transparency, reflectivity
    • B29C66/81268—Reflective to electromagnetic radiation, e.g. to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/836—Moving relative to and tangentially to the parts to be joined, e.g. transversely to the displacement of the parts to be joined, e.g. using a X-Y table
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/863—Robotised, e.g. mounted on a robot arm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1603—Laser beams characterised by the type of electromagnetic radiation
    • B29C65/1612—Infrared [IR] radiation, e.g. by infrared lasers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1677—Laser beams making use of an absorber or impact modifier
    • B29C65/1683—Laser beams making use of an absorber or impact modifier coated on the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/16—Laser beams
    • B29C65/1687—Laser beams making use of light guides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/306—Applying a mark during joining
    • B29C66/3062—Applying a mark during joining in the form of letters or numbers
    • B29C66/30621—Applying a mark during joining in the form of letters or numbers in the form of letters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7332—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products

Definitions

  • This invention relates generally to laser welding of thermoplastic materials.
  • the packages are typically made of clear plastic sheets (e.g., blister packages) by using RF welding methods, which are limited to a small number of thermoplastic materials (in practice, mostly PVC-based), which have the requisite electrical properties, such as a relatively high dielectric loss that provides the ability to convert alternating electric fields into heat.
  • RF welding methods which are limited to a small number of thermoplastic materials (in practice, mostly PVC-based), which have the requisite electrical properties, such as a relatively high dielectric loss that provides the ability to convert alternating electric fields into heat.
  • PVC-based thermoplastic materials
  • the process is not applicable or have very limited applicability to the most common plastics, from polyolefines to PC to Polystyrene to Polycarbonate, which in turn severely limits the material selection available for blister packaging.
  • RF welding Another problem of RF welding is inflexibility of the process, as the seam is limited by the shape and size of the electrodes - each package's shape would require the electrodes of a specific shape and size. Also, in practice the size of the package is limited by the required power capacity, as the RF is known by very high power requirements to achieve material melting. For example, for a perimeter seal of a 10 cm x 15 cm medical bag, the power requirements range from 1.7 to 2.9 KW ( Plastics and Composites Welding Handbook, Hanser Gardner Publications, Inc., 2003. p.262 ).
  • the movable second receiving part is moved in a joining direction and the path of the second receiving part and/or the force, with which the two workpieces are pressed against each other, is measured and the movement of the movable second receiving part is controlled in dependence of said the force or of said way.
  • document JP 2004 063332 A discloses a vehicular lamp in which a lamp lens and a lamp housing are joined by laser welding, wherein either the lamp lens or the lamp housing is made of a resin member that is transparent to laser light, and the other is formed of resin member being light-impermeable to the welding laser beam.
  • document US 2006 / 134 994 A discloses a beam welding apparatus that welds the housing and transparent cover of a vehicular lighting device via beam welding, wherein the beam welding apparatus includes a cover fixing jig including a beam transmitting part for pressing a transparent cover toward a housing while being arranged on the transparent cover with the welding part of the transparent cover overlaid on the welding part of the housing.
  • the beam welding apparatus further includes a beam irradiating part for irradiating beams onto the welding part of the housing through the beam transmitting part and the transparent cover to excite and heat the welding part of the housing.
  • the beam transmitting part finally includes a shielding part for shielding unnecessary luminous flux among the beams irradiated toward the welding part of the housing from the beam irradiating part.
  • document US 6 465 757 B1 shows a method and a device for laser joining of plastics or for joining plastics to other materials, which are brought into contact under pressure, with the workpiece closest to the laser beam source being largely transparent for the laser beam, and the second workpiece being as absorbent as possible.
  • Laser welding uses a laser beam to melt the plastic in the joint area by delivering controlled amount of energy to a precise location. This is based on the ease of controlling the beam size and the range of methods available for precise positioning and moving the beam.
  • thermoplastics can be welded using a proper laser source and appropriate joint design.
  • a laser welding method for joining portions of first and second workpieces.
  • the method comprises clamping together the portions of said first and second workpieces to be joined using a pair of clamping plates positioned to engage opposite sides of the first and second workpieces when the workpieces are adjoining each other with contacting surfaces, the first and second workpieces being made of thermoplastic material that is optically transparent and partially permeable to a laser beam having a wavelength of 2 microns and absorbs radiation from a laser beam; pressing said first and second workpieces together by urging at least one of said pair of clamping plates towards the other one of said clamping plates using an actuator; arranging a transparent glass plate having a mask thereon against a first surface of the first workpiece, said first surface being opposite a second opposing surface engaging the second workpiece, said mask being impermeable to said laser beam and forming a slot for passing said laser beam to the portion of the first surface of the first workpiece exposed by said slot such that heating and melting of the material of said workpieces
  • the invention also contemplates a laser welding system for joining portions of first and second workpieces made of thermoplastic material that is partially permeable to a laser beam but absorbs radiation from the laser beam.
  • the system includes a laser beam source configured to emit a laser beam having a wavelength of 2 microns; a first workpiece made of thermoplastic material that is optically transparent and partially permeable to said laser beam; a second workpiece made of thermoplastic material that optically transparent and partially permeable to said laser beam; a pair of clamping plates positioned and configured to engage opposite sides of said first and second workpieces when said first and second workpieces are adjoining each other with contacting surfaces, said pair of clamping plates being positioned relative to the laser beam source such that each of said first and second workpieces partially absorb said laser beam to cause melting in respective portions of said first and second workpieces exposed to said laser beam; an actuator configured to urge at least one of said pair of clamping plates toward the other one of said clamping plates to press said first and second workpieces together; a transparent glass plate
  • a laser source 10 generates a laser that is transmitted through a fiber cable 11 to a scan head 12 attached to a mount 13.
  • the mount 13 is coupled to orthogonal gantries 14 and 15.
  • One or more scanner mirrors within the scan head 12 are controlled by a processor-controlled drive unit 16 to direct a laser beam 17 downwardly onto a stack 18 that includes two thermoplastic workpieces 21 and 22 to be joined by welding.
  • the drive unit 16 is controlled to adjust the positions of the scanner mirrors to move the laser beam 17 in a manner required to illuminate a prescribed weld zone on the top surface of the stack 18.
  • the top layer 19 in the stack 18 is a transparent glass plate 19 that has a reflective-coated photo mask 20 on the bottom surface of the glass plate 19.
  • the mask 20 forms a slot 20a that permits the laser beam 17 to reach the upper workpiece 21, which at least partially absorbs the laser radiation.
  • the mask 20 limits the exposed area of the workpieces 21 and 22 to the desired weld zone defined by the slot 20a, and thus limits the melting of the upper workpiece 21 to the desired weld zone.
  • the mask 20 functions as a heat sink and cools the surface of the workpiece 21 in the areas outside the weld zone.
  • the mask 20 is on the top surface rather than the bottom surface of the glass plate 19.
  • One suitable material for the mask is chrome plated on the surface of the glass plate 19.
  • the movement of the scanner mirrors is controlled by the processor that controls the drive unit 16.
  • the movement of the laser beam 17 is controlled by driving the mount 13 along the gantries 14 and 15.
  • TTLW transmission laser welding
  • the workpieces are pre-assembled and clamped together to provide an intimate contact between their joining surfaces.
  • the laser beam is then delivered to the interface of the workpieces' interface through the upper transparent workpiece and is absorbed by the lower absorbing workpiece, which converts infrared energy into heat.
  • Carbon black and specially designed absorbers are blended into the resin of the lower workpiece, or applied to the surface, to enable infrared radiation to be absorbed in the lower workpiece.
  • the heat is conducted from the lower absorbing workpiece to the upper workpiece to melt the upper workpiece at the interface and form a bond. Precise positioning and clamping of the assembly ensures the intimate contact required for heat transfer between the parts.
  • a laser having a wavelength of about 2 microns commonly referred to as a "2 micron laser” is characterized by a greatly increased absorption by unfilled polymers, enabling a highly controlled melting through the thickness of plastic materials that do not have any absorbing agents and can be transparent in the visible wavelength range, i.e., "optically clear” parts such as polycarbonate or acrylic, without the need for any laser sensitive additives.
  • both workpieces absorb portions of the laser beam (preferably a fiber laser), and the adjacent contact surfaces of these two work pieces are bonded together in subsequent cooling under pressure.
  • the laser beam is directed at the contact surfaces at essentially a right angle through the mask so that the width of the laser beam spot on the upper workpiece is limited by the slot width in the mask.
  • the melting of the upper part is limited by the width of the slot in the mask as the beam is moved.
  • the workpieces are bonded together in subsequent cooling under pressure.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Robotics (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laser Beam Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)

Claims (13)

  1. Laserschweißverfahren zum Verbinden von Abschnitten eines ersten und eines zweiten Werkstücks (21, 22), wobei das Verfahren umfasst:
    Zusammenklemmen der zu verbindenden Abschnitte des ersten und des zweiten Werkstücks (21, 22) unter Verwendung eines Paares von Klemmplatten, die so positioniert sind, dass sie an gegenüberliegenden Seiten des ersten und des zweiten Werkstücks (21, 22) angreifen, wenn die Werkstücke (21, 22) mit ihren Kontaktflächen aneinanderliegen, wobei das erste und das zweite Werkstück (21, 22) aus einem thermoplastischen Material bestehen, das optisch transparent und teilweise durchlässig für einen Laserstrahl mit einer Wellenlänge von 2 Mikrometern ist und Strahlung von dem Laserstrahl (17) absorbiert;
    Zusammenpressen des ersten und des zweiten Werkstücks (21, 22), indem mindestens eine der beiden Klemmplatten unter Verwendung eines Aktuators in Richtung der anderen Klemmplatte gedrückt wird;
    Anordnen einer transparenten Glasplatte (19) mit einer Maske (20) darauf gegen eine erste Oberfläche des ersten Werkstücks (21), wobei die erste Oberfläche einer zweiten gegenüberliegenden Oberfläche gegenüberliegt, die mit dem zweiten Werkstück (22) in Anlage befindlich ist, wobei die Maske (20) für den Laserstrahl (17) undurchlässig ist und einen Schlitz (20a) bildet, durch den der Laserstrahl (17) zu dem durch den Schlitz (20a) freigelegten Abschnitt der ersten Oberfläche des ersten Werkstücks (21) gelangen kann, so dass das Erhitzen und Schmelzen des Materials der Werkstücke (20, 21) auf die Breite des Schlitzes (20a) beschränkt ist, wobei die Maske (20) ein reflektierend beschichtetes Foto ist und sich auf einer Unterseite der transparenten Glasplatte (19) befindet und Wärme von dem ersten Werkstück (21) absorbiert, um die nicht dem Laserstrahl (17) ausgesetzten Teile des ersten Werkstücks (21) zu kühlen;
    Richten des Laserstrahls (17) unter Verwendung einer Antriebseinheit (16) auf den Schlitz (20a) und durch die transparente Glasplatte (19) hindurch, um den Schlitz (20a) so zu beleuchten, dass das erste und das zweite Werkstück (21, 22) den Laserstrahl (17) absorbieren, um ein Erhitzen und ein Schmelzen in den jeweiligen Abschnitten des ersten und des zweiten Werkstücks (21, 22) zu bewirken, um das erste und das zweite Werkstück (21, 22) entlang des Schlitzes (20a) zu verbinden, während die Werkstücke (21, 22) zusammengeklemmt bleiben; und
    Kühlen der geschmolzenen Abschnitte des ersten und zweiten Werkstücks (21, 22), um die verbundenen Abschnitte der Werkstücke (21, 22) zu verfestigen, um eine Schweißnaht zu bilden, während die Werkstücke zusammengeklemmt bleiben.
  2. Laserschweißverfahren nach Anspruch 1, wobei der Laserstrahl (17) ein Lichtleitfaserstrahl ist.
  3. Laserschweißverfahren nach Anspruch 1, wobei der Laserstrahl (17) im Wesentlichen senkrecht zu der Maske (20) ist.
  4. Laserschweißverfahren nach Anspruch 1, wobei die Maske (20) auf Glas Chrom-plattiert ist.
  5. Laserschweißverfahren nach Anspruch 1, wobei jedes der ersten und zweiten Werkstücke (21, 22) ein ungefülltes Polymer ist, das optisch transparent ist, und der Laserstrahl (17) teilweise von dem Polymer absorbiert wird.
  6. Laserschweißsystem, umfassend:
    eine Laserstrahlquelle (10), die so konfiguriert ist, dass sie einen Laserstrahl (17) mit einer Wellenlänge von 2 Mikrometern emittiert;
    ein erstes Werkstück (21) aus einem thermoplastischen Material, das optisch transparent und für den Laserstrahl (17) teilweise durchlässig ist;
    ein zweites Werkstück (22) aus thermoplastischem Material, das optisch transparent und für den Laserstrahl (17) teilweise durchlässig ist;
    ein Paar Klemmplatten, die so positioniert und konfiguriert sind, dass sie mit den gegenüberliegenden Seiten des ersten und zweiten Werkstücks (21, 22) in Eingriff gelangen, wenn das erste und zweite Werkstück (21, 22) mit ihren Kontaktflächen aneinanderliegen, wobei das Paar Klemmplatten relativ zur Laserstrahlquelle (10) so positioniert ist, dass jedes der ersten und zweiten Werkstücke (21, 22) den Laserstrahl (17) teilweise absorbiert, um in den jeweiligen Abschnitten des ersten und zweiten Werkstücks (21, 22), die dem Laserstrahl (17) ausgesetzt sind, ein Schmelzen zu bewirken;
    einen Aktuator, der so konfiguriert ist, dass er mindestens eine des Paares von Klemmplatten in Richtung der anderen Klemmplatte drückt, um das erste und das zweite Werkstück (21, 22) gegeneinander zu pressen;
    eine transparente Glasplatte (19) und eine Maske (20) darauf, wobei die Maske (20) ein reflektierend beschichtetes Foto ist und für den Laserstrahl (17) undurchlässig ist und einen Schlitz (20a) zum Durchlassen des Laserstrahls (17) zu dem durch den Schlitz (20a) freigelegten Abschnitt des ersten Werkstücks (21) bildet, so dass das Erhitzen und Schmelzen des Materials der Werkstücke (21, 22) auf die Breite des Schlitzes (20a) beschränkt ist, wobei die Maske (20) auf der transparenten Glasplatte (19) Wärme aus dem Material (21) des ersten Werkstücks (21) absorbiert, um die nicht dem Laserstrahl (17) ausgesetzten Teile des ersten Werkstücks (21) zu kühlen; und
    eine Antriebseinheit (16), die so konfiguriert ist, dass sie den Laserstrahl (17) so bewegt, dass er den Schlitz (20a) beleuchtet, um das erste und zweite Werkstück (21, 22) zu schmelzen und zu verbinden, während die Werkstücke (21, 22) zusammengeklemmt bleiben.
  7. Laserschweißsystem nach Anspruch 6, wobei der Laserstrahl (17) einen Lichtleitfaserstrahl aufweist.
  8. Laserschweißsystem nach einem der vorstehenden Ansprüche, wobei der Laserstrahl (17) im Wesentlichen senkrecht zu der Maske (20) ist.
  9. Laserschweißsystem nach einem der vorstehenden Ansprüche, wobei die Maske (20) auf Glas Chrom-plattiert ist.
  10. Laserschweißsystem nach einem der vorstehenden Ansprüche, wobei jedes der ersten und zweiten Werkstücke (21, 22) ein ungefülltes Polymer ist, das optisch transparent ist, und der Laserstrahl (17) von dem Polymer teilweise absorbiert wird.
  11. Laserschweißsystem nach einem der vorstehenden Ansprüche, wobei sich die Maske (20) auf einer Oberseite der Glasplatte gegenüber einer Unterseite derselben befindet, wobei die Unterseite dem ersten Werkstück zugewandt ist.
  12. Laserschweißsystem nach einem der vorstehenden Ansprüche, wobei jedes der ersten und zweiten Werkstücke (21, 22) keine Absorptionsmittel enthält.
  13. Laserschweißsystem nach einem der Ansprüche 6 bis 10 oder 12, wobei die Maske (20) eine reflektierend beschichtete Fotomaske auf einer dem ersten Werkstück (21) zugewandten Unterseite der Glasplatte ist.
EP17772831.8A 2016-09-15 2017-09-15 Laserschweisssystem und verfahren unter verwendung einer maske zur steuerung der breite der schweissung Active EP3512693B1 (de)

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US15/266,182 US10538036B2 (en) 2016-09-15 2016-09-15 Laser welding system and method using cooling mask to control the width of the weld
PCT/US2017/051734 WO2018053238A1 (en) 2016-09-15 2017-09-15 Laser welding system and method using a mask to control the width of the weld

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US20180071990A1 (en) 2018-03-15
CN109641398A (zh) 2019-04-16
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US10538036B2 (en) 2020-01-21
JP7062009B2 (ja) 2022-05-02
CN109641398B (zh) 2021-08-10
US11059233B2 (en) 2021-07-13
WO2018053238A1 (en) 2018-03-22
US20200130286A1 (en) 2020-04-30

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